A clamp

Abstract

The application relates to a device for fixing or positioning a workpiece, in particular to a clamp, which comprises a rotating mechanism, a mounting disc, a plurality of connecting rod mechanisms and a plurality of clamping jaw structures; the mounting disc is provided with an arc-shaped concave groove; the plurality of connecting rod mechanisms are arranged in the arc-shaped concave groove and are spaced apart along the circumference of the mounting disc; each connecting rod mechanism is connected to the mounting disc; the plurality of clamping jaw structures are connected to the plurality of connecting rod mechanisms one by one; the rotating mechanism is connected to the mounting disc and drives the rotating movement of the mounting disc, so that the plurality of connecting rod mechanisms drive the plurality of clamping jaw structures to move towards the direction of the rotating center under the action of centrifugal force to clamp the workpiece. Compared with the prior art, the threaded gap error generated by the threaded clamping can be eliminated, the position and angle of the workpiece can be kept stable during the machining process, and the machining precision is improved; meanwhile, the clamp also has the advantages of simple structure and connection relationship, high stability, low cost, long service life and stable performance and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to a device for fixing or positioning a workpiece, in particular to a fixture. BACKGROUND

[0002] In recent years, semiconductor equipment has developed rapidly, involving semiconductor components, integrated circuit manufacturing components, etc., and these components are mainly completed by ensuring the machining precision on a machine tool through the precision of the machine tool itself and the tooling fixture. Taking the machining of a rotary body part requiring concentricity and roundness precision as an example, the machine tool spindle is used as the power source during machining, and the machined part is clamped on the fixture connected with the spindle. In this process, the machined part and the fixture need to be adjusted multiple times to make the respective axes of the machined part and the fixture coincide as much as possible, ensuring that the concentricity and roundness of the part during machining reach the runout precision of the machine tool spindle. In order to ensure the machining precision and quality of the part, the part and the fixture need to be ensured on the same axis and coincide with the spindle axis.

[0003] As shown in Figure 1 and Figure 2 , the existing machine tool centering part fixture includes a spindle 101, a fixture disc 102, a centering clamp jaw 103, and a part 104. The spindle 101 is connected and fixed with the fixture disc 102 through a bolt structure, and the centering clamp jaw 103 is connected with the fixture disc 102 through a flat thread pair 106 using a bolt pair 105. The adjustment is made through the corresponding bolt pair 105 on the fixture disc 102 corresponding to the centering clamp jaw 103, to realize the clamping of the part 104 and the coincidence of the axis of the part 104 with the axis of the fixture disc 102 and the spindle 101. In the existing structure, the part 104 is mainly clamped by the centering clamp jaw 103, and the part 104 is tightly attached to the centering clamp jaw 103 by external force and gravity. After being tightly attached, the centering clamp jaw 103 is adjusted one by one through the adjusting bolts on the fixture disc 102, and is clamped. However, such fixtures generally have the following problems:

[0004] 1. Each centering clamp jaw 103 has an uncertain error during machining and manufacturing, which increases the cumulative error when multiple centering clamp jaws 103 are used at the same time, finally leading to an increase in the offset of the axis of the part 104 from the axis of the spindle 101;

[0005] 2. In order to ensure smooth displacement between the thread pairs 106, a certain amount of thread gap is left during design, which leads to an increase in the offset of the part from the spindle axis, affecting the roundness and concentricity precision.

[0006] There are also some clamps on the market that use self-adaptive clamp shafts, such as three-jaw centrifugal force self-centering chucks, which use cross-shaped hinge-connected clamping jaws to cooperate with elastic members to achieve automatic clamping, but the structure is relatively complex, the manufacturing accuracy of the components is high, and the assembly of the clamp itself requires more assembly, resulting in the superposition of assembly errors and higher costs.

[0007] Therefore, there is a need to provide a new clamp. SUMMARY

[0008] To solve the above technical problems, the purpose of the present application is to provide a clamp that can adaptively adjust the coincidence degree with the workpiece and the axis of the clamp, taking into account the cost and structural complexity, improving the machining precision while reducing the development difficulty and time.

[0009] In a first aspect of the present application, a clamp is provided, comprising a rotating mechanism, a mounting disc, a plurality of link mechanisms, and a clamping jaw structure; the mounting disc is provided with an arc-shaped recess; the plurality of link mechanisms are arranged in the arc-shaped recess along the circumferential direction of the mounting disc, each link mechanism is connected to the mounting disc, and the plurality of clamping jaw structures are connected to the plurality of link mechanisms one by one; the rotating mechanism is connected to the mounting disc and drives the rotating movement of the mounting disc, so that the plurality of link mechanisms drive the plurality of clamping jaw structures to move towards the center of rotation under the action of centrifugal force to clamp the workpiece.

[0010] In an optional scheme, the mounting disc is in the shape of a circular truncated cone or a circular cylinder, which is specifically set according to requirements;

[0011] In an optional scheme, the arc-shaped recess can also be replaced by an arc-shaped convex surface, etc.

[0012] In a preferred scheme of the present application, the inner wall surface of the arc-shaped recess is a spherical surface.

[0013] In a further scheme of the present application, the link mechanism comprises a first rod and a second rod; one end of the first rod and one end of the second rod are both rotationally connected to the clamping jaw structure, and the other end of the second rod is rotationally connected to the inner wall of the arc-shaped recess; the other end of the first rod is slidingly connected to the inner wall of the arc-shaped recess, so as to generate centrifugal force under the rotation of the rotating mechanism, so as to drive the clamping jaw structure to move towards the workpiece.

[0014] In an optional scheme, the first rod and the second rod are both straight arms.

[0015] The first rod is the main rod, and the second rod is the supporting rod, and in an optional scheme, the second rod can be omitted.

[0016] In a further scheme of the present application, the link mechanism further comprises a fixed seat, and the fixed seat is fixed to the inner wall of the arc-shaped recess; the other end of the second rod is rotationally connected to the inner wall of the arc-shaped recess through the fixed seat.

[0017] In an alternative aspect of the present application, one end of the fixed seat is connected at the end point of the fixed seat, and the other end extends obliquely away from the rotation center.

[0018] In a further aspect of the present application, the inner wall of the arc-shaped groove is provided with a plurality of sliding grooves, the other end of the first rod is matched with the corresponding sliding groove along the radial direction of the arc-shaped groove, and the other end of the first rod slides relative to the sliding groove under the rotation of the rotating mechanism.

[0019] In the present application, the sliding groove and the arc-shaped groove maintain the same curvature, i.e., the curvatures of the sliding groove and the arc-shaped groove are consistent.

[0020] In a further aspect of the present application, the sliding groove, the first rod and the second rod are arranged in the same plane.

[0021] In an alternative aspect of the present application, the number of the clamping jaw structures is three, and the three clamping jaw structures are arranged at an interval of 120° in the circumferential direction.

[0022] The number of the clamping jaw structures can also be four or six, and the interface is determined according to the requirements.

[0023] In a further aspect of the present application, the clamping jaw structure comprises: a mounting portion provided with a hinge mounting hole, the mounting portion being rotatably connected to the first rod and the second rod through the hinge mounting hole; and a clamping portion connected to the mounting portion, and the clamping portion and the surface shape of the workpiece are adapted to each other.

[0024] In a further aspect of the present application, the inner side surface of the sliding groove is provided with a limiting groove in the direction of the sliding groove, and the limiting groove is used to limit the movement range of the rolling member in the sliding groove.

[0025] In a further aspect of the present application, the clamp further comprises a locking structure, and the locking structure connects the first rod and the second rod through the hinge mounting hole.

[0026] In a further aspect of the present application, the rotating mechanism comprises a main shaft and a driving member, the main shaft is connected to the side of the mounting disc away from the arc-shaped groove, the main shaft and the mounting disc are coaxially arranged, and the driving member is used to drive the main shaft to rotate.

[0027] In summary, the present application provides a clamp, which comprises a mounting disc, a plurality of connecting rod mechanisms and a rotating mechanism; by arranging an arc-shaped groove on the mounting disc, the plurality of connecting rod mechanisms are connected in the arc-shaped groove, the rotating mechanism is connected to the mounting disc and drives the rotating movement of the mounting disc, so that the plurality of connecting rod mechanisms drive the plurality of jaw structures to move in the direction close to the workpiece under the action of centrifugal force, the gap between the jaw structure and the surface of the workpiece is adaptively eliminated, the axial coincidence degree of the clamp and the workpiece is adjusted, compared with the prior art, the thread gap error generated by the threaded clamping can be eliminated, the position and angle of the workpiece during machining are ensured to be stable, and the machining precision is improved; meanwhile, the clamp has the advantages of simple structure and connection relationship, high stability, low cost, long service life and stable performance; and since the clamp is simple to operate, it can be widely applied in industrial production, greatly reduces the requirement for technical ability of personnel during use of the prior art, and improves the efficiency of centering the part.

[0028] Other features and advantages of the embodiments of the present application will be described in the following detailed description of the embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0030] Figure 1 A structural schematic view of the clamp of the prior art provided by the embodiments of the present application;

[0031] Figure 2 A sectional view of the clamp of the prior art provided by the embodiments of the present application;

[0032] Figure 3 An axial side schematic view of a clamp provided by the embodiments of the present application;

[0033] Figure 4 A sectional view of the clamp provided by the embodiments of the present application;

[0034] Figure 5 A sectional view of part of the structure of the clamp provided by the embodiments of the present application;

[0035] Figure 6 A sectional view of part of the structure of the mounting disc in the clamp provided by the embodiments of the present application;

[0036] Figure 7The movement schematic of the connecting rod mechanism and the clamping jaw structure in the clamp provided by the embodiment of the present application, wherein the dashed line schematically shows the clamp in the working state, and the solid line shows the non-working state; and

[0037] Figure 8 The left side is a sectional view of the clamp and the workpiece in the non-working state, Figure 8 The right side is a sectional view of the clamp and the workpiece in the working state.

[0038] Explanation of reference signs:

[0039] 100, clamp;

[0040] 10, rotating mechanism; 11, main shaft;

[0041] 20, mounting disc; 21, arc-shaped groove; 22, sliding groove; 221, limiting groove;

[0042] 30, connecting rod mechanism; 31, first rod; 32, second rod; 33, fixed seat;

[0043] 40, clamping jaw structure; 41, mounting part; 42, clamping part; 411, hinge mounting hole. DETAILED DESCRIPTION

[0044] In order to make the above and other features and advantages of the present application clearer, the present application will be further described below with reference to the drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation and are only illustrative, not restrictive.

[0045] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without the specific details, and that numerous implementation options, modifications and combinations are possible. In other instances, well-known features are not described in detail to avoid obscuring this application.

[0046] In order to make the above and other features and advantages of the present application clearer, the present application will be further described below with reference to the drawings. It should be understood that the specific embodiments given herein are for the purpose of explanation and are only illustrative, not restrictive.

[0047] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] Please refer to Figure 3 , Figure 3 A schematic view of a clamp 100 provided by an embodiment of the present application is shown in FIG. 1. The clamp 100 includes a rotating mechanism 10, a mounting disc 20, a connecting rod mechanism 30 and a clamping jaw structure 40.

[0050] In an optional solution, the mounting disc 20 is in the shape of a circular truncated cone or a circular cylinder, which is determined according to requirements. The rotating mechanism 10 is connected to one side of the mounting disc 20, which is used to generate driving force to drive the mounting disc 20 to rotate along the axis.

[0051] Further, each connecting rod mechanism 30 is connected to the side of the mounting disc 20 away from the rotating mechanism 10, and a plurality of clamping jaw structures 40 are connected to the plurality of connecting rod mechanisms 30 one by one, and each clamping jaw structure 40 is connected to one connecting rod mechanism 30 respectively. The connecting rod mechanism 30 plays a role of connection and transmission between the mounting disc 20 and the clamping jaw structure 40, so as to control the motion trajectory and force of the clamping jaw structure 40. The clamping jaw structure 40 is used to fix and position the workpiece, so as to realize the fixation and positioning of the workpiece.

[0052] Specifically, on the other side of the mounting disc 20, an arc-shaped groove 21 is provided inwardly concave relative to the side, and a plurality of connecting rod mechanisms 30 are arranged in the arc-shaped groove 21 and spaced along the circumference of the mounting disc 20. The load can be dispersed to the connecting rod mechanisms 30, so as to provide better balanced force, avoid excessive pressure on a single connecting rod during operation and processing, reduce the stress and fatigue of the connecting rod mechanism 30, improve the stability and prolong the service life.

[0053] Wherein, when the rotating mechanism 10 drives the mounting disc 20 to rotate, the plurality of connecting rod mechanisms 30 drive the plurality of clamping jaw structures 40 to move close to the workpiece under the action of centrifugal force to clamp the workpiece.

[0054] It can be understood that the connecting rod mechanism 30 includes a plurality of rod members connected together, wherein each rod member is connected to an adjacent rod member by a hinge or other connection means; when rotating, the connecting point of the connecting rod mechanism 30 on the mounting disc 20 will generate outward centrifugal force due to the arc-shaped groove 21, and based on this, in one general inventive concept of the embodiment of the present application, i.e. by utilizing the characteristics of the connecting rod mechanism 30 in transmitting force, rotation or changing the direction of movement, the plurality of connecting rod mechanisms 30 can convert the centrifugal force generated by rotation into mechanical movement of the clamping jaw structure 40; during the rotation of the entire clamp 100, the clamping jaw structure 40 can be automatically moved towards the rotation center to gradually adjust the workpiece central axis to be consistent with the rotation center, and the rotation center can be regarded as the clamp central axis, thereby realizing self-adaptive alignment of the workpiece central axis and the clamp central axis.

[0055] Meanwhile, the plurality of clamping jaw structures 40 can be moved in parallel and adjusted by the connecting rod mechanism 30, and the clamping jaw structure 40 will generate a certain clamping force when clamping the workpiece, thereby gradually fine-tuning the position of the workpiece.

[0056] It should be understood by those skilled in the art that the connecting rod mechanism 30 only needs to retain one degree of freedom that can freely swing under the action of centrifugal force to achieve the above effects, and at one end of the connecting rod mechanism 30 connected to the mounting disc 20, under the action of centrifugal force, it starts to move in a direction away from the rotation center, and at the other end connected to the clamping jaw structure 40, it moves in a direction close to the rotation center, i.e. it can clamp the workpiece, and as the centrifugal force increases, the clamping force of the clamping jaw structure 40 and the workpiece also gradually increases.

[0057] In summary, one general inventive concept of the present application is to provide a clamp 100, which includes a rotating mechanism 10, a mounting disc 20, a connecting rod mechanism 30 and a clamping jaw structure 40; by providing an arc-shaped groove 21 on the mounting disc 20, connecting a plurality of connecting rod mechanisms 30 in the arc-shaped groove 21, connecting the rotating mechanism 10 to the mounting disc 20 and driving the mounting disc 20 to rotate, so that the plurality of connecting rod mechanisms 30 drive the plurality of clamping jaw structures 40 to move towards the workpiece under the action of centrifugal force, to self-adaptively eliminate the gap between the clamping jaw structure 40 and the surface of the workpiece, and to adjust the degree of coincidence of the axis of the clamp 100 and the workpiece, compared with the prior art, the thread gap error generated by the threaded clamping can be eliminated, the position and angle of the workpiece can be kept stable during the machining process, and the machining precision is improved, and at the same time, the clamp 100 also has the advantages of simple structure and connection relationship, high stability, low cost, etc.

[0058] So based on the same inventive concept, it should be known that if the arc-shaped groove 21 on the mounting disc 20 is improved, such as being changed to a convex arc-shaped mounting surface, so that the connection between the connecting rod mechanism 30 and the mounting disc 20 changes from "centrifugal force" to "centripetal force", or the connecting rod mechanism 30 is replaced by other structures to realize the swinging effect, but the effect realized is the same, that is, adjusting the axial coincidence degree of the clamp 100 and the workpiece by using the unified inventive concept, which should belong to the protection range equivalent to the embodiments of the present application.

[0059] The present scheme will be described below through a specific embodiment:

[0060] Firstly, referring to Figure 4 , Figure 5 , Figure 4 is a sectional view of the clamp 100 provided by the embodiments of the present application; Figure 5 is a sectional view of the clamp 100 provided by the embodiments of the present application.

[0061] As above, the clamp 100 includes a rotating mechanism 10, a mounting disc 20, a connecting rod mechanism 30 and a jaw structure 40.

[0062] The rotating mechanism 10 includes a main shaft 11 and a driving member (not shown in the figure), the driving member is connected to one side of the main shaft 11, the other side of the main shaft 11 is connected to the side of the mounting disc 20 away from the jaw structure 40, the main shaft 11 and the mounting disc 20 are coaxially arranged, and the driving member is used to drive the main shaft 11 to rotate.

[0063] In the embodiments of the present application, a motor is used as the driving member, which converts electrical energy into mechanical energy and transmits the rotary torque through the main shaft 11. The motor can be a direct current motor, an alternating current motor or a stepping motor, and the specific selection depends on the application requirement. The driving member can control the rotating speed of the main shaft 11 to adjust the clamping force on the workpiece.

[0064] In the embodiments of the present application, the main shaft 11 and the mounting disc 20 can be rigidly connected, or can be directly integrated.

[0065] Further, the connecting rod mechanism 30 includes a first rod 31 and a second rod 32; both the first rod 31 and the second rod 32 are straight linear rods, one end of the first rod 31 and one end of the second rod 32 are both rotationally connected to the jaw structure 40, and the other end of the second rod 32 is rotationally connected to the inner wall of the arc-shaped groove 21. The other end of the first rod 31 is slidingly connected to the inner wall of the arc-shaped groove 21 to generate centrifugal force under the rotation of the rotating mechanism 10, so as to push the jaw structure 40 to move close to the workpiece.

[0066] Further, the inner wall surface of the arc-shaped groove 21 on the mounting disc 20 is provided as a spherical surface, and the most concave point of the spherical surface is coaxial with the central axis of the main shaft 11.

[0067] It can be understood that, when the inner wall surface of the arc-shaped groove 21 on the mounting disc 20 is provided as a spherical surface, and the most concave point of the spherical surface is coaxial with the central axis of the main shaft 11, during rotation of the mounting disc 20, the centrifugal force causes the end of the first rod 31 that is in sliding connection with the arc-shaped groove 21 to move, specifically to deviate from the track of the arc-shaped groove 21 to the outside of the rotation center. Since the first rod 31 is a rigid member, the centrifugal force generated under the rotation of the rotating mechanism 10 causes the first rod 31 to swing, that is, the other end (i.e., the side connected with the jaw structure 40) is close to the rotation center. Since the most concave point of the arc-shaped groove 21 is coaxial with the main shaft, the center of the main shaft is the rotation center of the movement, and at this time, the first rod 31 can automatically drive the workpiece to adjust the central axis of the workpiece to be consistent with the rotation center, thereby realizing the automatic adjustment function of the central axis of the workpiece.

[0068] As shown in the figure, the second rod 32 is preferably located on the side of the first rod 31 closer to the rotation center, so that the first rod 31, the second rod 32, and the arc-shaped groove 21 form a triangular linkage mechanism. The first rod 31 is a moving rod, one end of which is in sliding connection with the arc-shaped groove 21, and the other end is rotatably connected to the jaw structure 40, and can realize the swing of the first rod 31 under the action of the centrifugal force. The second rod 32 is also a moving rod, and mainly serves to stably support the first rod 31, one end of which is rotatably connected to the inner wall of the arc-shaped groove 21, and the other end is also rotatably connected to the jaw structure 40.

[0069] Referring to Figure 6 and in combination with Figure 4 Figure 5 , Figure 6 the partial structure sectional view of the mounting disc 20 in the clamp 100 provided by the embodiment of the present application.

[0070] In an alternative manner of the embodiment of the present application, the inner wall of the arc-shaped groove 21 is provided with a plurality of sliding grooves 22. The sliding grooves 22 are arranged along the radial direction of the arc-shaped groove 21; all the sliding grooves 22 are directed to the rotation center. The other end of the first rod 31 is matched with the corresponding sliding groove 22 to slide relative to the sliding groove 22 under the rotation of the rotating mechanism.

[0071] ​The curvature of the arc-shaped groove 21 and the sliding groove 22 is consistent, and the arc-shaped groove 21 is configured as a same fixed reference of the first rod 31 and the second rod 32, so that the sliding groove 22, the first rod 31 and the second rod 32 form a stable triangular linkage, which can effectively avoid the first rod 31 from being stuck or shaken in the sliding groove 22 and avoid the second rod 32 from being deformed.

[0072] The linkage 30 further comprises a fixed seat 33 fixed to the inner wall of the arc-shaped groove 21, and the other end of the second rod 32 is rotationally connected to the inner wall of the arc-shaped groove 21 through the fixed seat 33.

[0073] Specifically, one end of the second rod 32 is connected to the fixed seat 33, and the other end is inclined to extend away from the rotation center, so that the length of the second rod 32 can be reduced. Since the second rod 32 is a support member, the reduction of the length-to-thickness ratio can improve the structural rigidity of the second rod 32 and avoid oscillation or instability. In addition, during the rotation of the clamp 100, the shorter second rod 32 can reduce the effect of inertial force and moment of inertia to reduce the dynamic response of the second rod 32. Moreover, the second rod 32 is inclined outward from one end to the other end of the fixed seat 33, which can also reduce the stress load applied by the workpiece to the second rod 32, so that the structure is more stable and the accuracy is improved.

[0074] In the optional scheme of the embodiment, the number of the clamping jaw structures 40 is three, and the three clamping jaw structures 40 are arranged at an interval of 120° in the circumferential direction.

[0075] Continuing to refer to Figure 5 The clamping jaw structure 40 comprises a mounting portion 41 and a clamping portion 42. The mounting portion 41 is provided with a hinge mounting hole 411, and the mounting portion 41 is rotationally connected to the first rod 31 and the second rod 32 through the hinge mounting hole 411. The clamping portion 42 is connected to the mounting portion 41, and the clamping portion 42 and the surface shape of the workpiece are adapted to each other.

[0076] The sliding groove 22, the first rod 31 and the second rod 32 need to be arranged in the same plane. Since the force system of the first rod 31 and the second rod 32 is consistent and coupled, the motion trajectories of the first rod 31 and the second rod 32 are in the same plane dimension (i.e., the transverse section of the central axis of the workpiece), which reduces the error of the workpiece during self-adaptation and clamping of the shaft, thereby ensuring that the clamping jaw structure 40 is highly coincident with the clamped surface of the workpiece, improving the accuracy of the alignment positioning, and making the central axis of the workpiece and the central axis of the clamp infinitely close to coincide.

[0077] The clamp 100 further comprises a locking structure (not shown in the figure), which connects the first rod 31 and the second rod 32 through the hinge mounting hole 411.

[0078] It can be understood that when the workpiece is placed in the clamping jaw structure 40, the tightening locking structure is tightened to generate a pre-tightening force on the entire connecting rod mechanism 30 at the hinge mounting hole 411, so as to preliminarily limit the degrees of freedom of the first rod member 31 and the second rod member 32, and the locking force is lower than the centrifugal force generated by rotation in working, so that when the clamp rotates, the first rod member 31 and the second rod member 32 move and start to adaptively adjust the alignment of the workpiece shaft center and the clamp shaft center.

[0079] The connecting rod mechanism further comprises a rolling member (not shown in the figure) connected to one end of the first rod member 31 and the sliding groove 22.

[0080] It can be understood that the "inner side surface" refers to the left and right surfaces adjacent to the bottom surface in the sliding groove 22, and the limiting groove 221 is arranged transversely in the sliding groove 22. The limiting groove 221 limits the movement range of the first rod member 31 in the sliding groove 22. On the one hand, it limits the movement stroke of the end of the first rod member 31, so that the first rod member 31 swings within a predetermined range. On the other hand, it can prevent the first rod member 31 from being stuck or shaking transversely, so as to ensure that the movement of the first rod member 31 is in the same dimension and stable and reliable when the clamp is used, improve the movement precision, and at the same time, prevent the second rod member 32 from being subjected to an adverse force in the connecting rod movement, so as to maintain the structural stability, working precision and service life of the clamp 100.

[0081] In combination with the foregoing figures and referring to Figure 7 and Figure 8 , Figure 7 FIG. 4 is a schematic diagram of the movement of the connecting rod mechanism 30 and the clamping jaw structure 40 in the clamp 100 provided by the embodiment of the present application, wherein the dashed line schematically shows the working state of the clamp 100, and the solid line shows the non-working state. Figure 8 The left side is a cross-sectional view of the clamp and the workpiece in the non-working state, Figure 8 and the right side is a cross-sectional view of the clamp and the workpiece in the working state.

[0082] As shown in the figure, the clamp 100 is in a non-working state, the first rod 31, the second rod 32 and the jaw structure 40 are all in a free state, at this time the jaw structure 40 is separated from the workpiece, at this time the workpiece can be installed or disassembled by adjusting the locking structure. When the main shaft 11 rotates to drive the whole clamp 100 to rotate, with the increase of the rotating speed, the centrifugal force acting on the sliding groove 22 is greater, the sliding groove 22 at the inner wall of the arc-shaped groove 21 will also be subjected to the centrifugal force, under the action of the centrifugal force, the rolling pin on the first rod 31 will slide in the sliding groove 22 in the trend of moving away from the rotating center to the outside, the second rod 32 moves with the first rod 31 as the rotating point, at this time the one end of the connecting rod group composed of the first rod 31 and the second rod 32 connected with the jaw structure 40 will move to the rotating center, when the rotating speed is greater, the holding force of the jaw structure 40 on the workpiece is greater, and because any point on the inner concave surface of the sliding groove 22 will intersect with the clamp center axis, when the connecting rod group composed of the first rod 31 and the second rod 32 works, it will accurately clamp the clamp center axis, so that the workpiece center axis coincides with the clamp center axis.

[0083] Meanwhile, since the first rod 31 and the second rod 32 are connected through the same hinge mounting hole 411, the profiled surface (the contact surface with the workpiece) of the clamping part 42 is consistent with the profile feature of the contact part of the workpiece, and during the movement of the first rod 31 and the second rod 32, the profiled surface of the clamping part 42 can always be parallel to the clamped surface of the workpiece, so that stable clamping of the workpiece can be realized, the stability and precision of clamping can be improved, and the attitude stability of the workpiece during machining can be ensured.

[0084] In summary, the clamp 100 provided by the embodiment of the present application uses the first rod 31 and the second rod 32, and utilizes the centrifugal effect generated by the inner concave surface of the arc-shaped groove 21 during high-speed rotation, so that the workpiece center axis coincides with the clamp center axis, compared with the prior art, the error existing in the mechanical positioning structure can be eliminated, and the coincidence degree with the arc-shaped groove axis can be adaptively adjusted. Meanwhile, the clamp can greatly reduce the requirement for technical ability of personnel during use of the prior art, and improve the efficiency of centering of the part.

[0085] Any combination of the above-described technical features can be made. Although not all possible combinations of the technical features are described, any combination of the technical features should be considered to be covered by the present specification, as long as there is no contradiction in such combination.

[0086] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still adjust the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these adjustments or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A clamp characterized in that, The rotating mechanism, the mounting disc, the plurality of connecting rod mechanisms and the plurality of clamping jaw structures are provided. The mounting disc is provided with an arc-shaped concave groove. The plurality of connecting rod mechanisms are arranged in the arc-shaped concave groove and spaced along the circumference of the mounting disc. The rotating mechanism is connected to the mounting disc and drives the mounting disc to rotate, so that the plurality of connecting rod mechanisms drive the plurality of clamping jaw structures to move towards the center of rotation under the action of centrifugal force to clamp the workpiece. The connecting rod mechanism comprises a first rod and a second rod. One end of the first rod and one end of the second rod are rotatably connected to the clamping jaw structure. The other end of the second rod is rotatably connected to the inner wall of the arc-shaped concave groove. The other end of the first rod is slidably connected to the inner wall of the arc-shaped concave groove.

2. The clamp of claim 1, wherein The inner wall of the arc-shaped concave groove is provided with a plurality of sliding grooves arranged along the radial direction of the arc-shaped concave groove. The other end of the first rod cooperates with the corresponding sliding groove to slide relative to the sliding groove under the action of the rotation of the rotating mechanism. The inner wall surface of the arc-shaped concave groove is a spherical surface.

3. The clamp of claim 2, wherein 4. The clamp of claim 3, wherein The connecting rod mechanism further comprises a fixed seat fixed to the inner wall of the arc-shaped concave groove.

5. The clamp of claim 2, wherein The other end of the second rod is rotatably connected to the inner wall of the arc-shaped concave groove through the fixed seat. One end of the fixed seat is connected at the end point of the sliding groove, and the other end extends obliquely away from the center of rotation. The clamping jaw structure comprises: a mounting portion provided with a hinge mounting hole, the mounting portion being rotatably connected to the first rod and the second rod through the hinge mounting hole; and a clamping portion connected to the mounting portion, and the clamping portion and the surface shape of the workpiece are adapted to each other.

6. The clamp of claim 1, wherein 7. The clamp of claim 5, wherein The connecting rod mechanism further comprises a rolling member connected to the other end of the first rod.

8. The clamp of any one of claims 1 to 7, wherein, The inner side surface of the sliding groove is provided with a limiting groove along the direction of the sliding groove, and the limiting groove is used to limit the movement range of the rolling member in the sliding groove. The clamp further comprises a locking structure connecting the first rod and the second rod through the hinge mounting hole. The rotating mechanism comprises a main shaft connected to the side of the mounting disc away from the arc-shaped concave groove, and a driving member for driving the main shaft to rotate.

Images